EP0050384A1 - Elimination, dans un récepteur radar à impulsions, de signaux parasites provenant de N sources distinctes - Google Patents

Elimination, dans un récepteur radar à impulsions, de signaux parasites provenant de N sources distinctes Download PDF

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Publication number
EP0050384A1
EP0050384A1 EP81201104A EP81201104A EP0050384A1 EP 0050384 A1 EP0050384 A1 EP 0050384A1 EP 81201104 A EP81201104 A EP 81201104A EP 81201104 A EP81201104 A EP 81201104A EP 0050384 A1 EP0050384 A1 EP 0050384A1
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EP
European Patent Office
Prior art keywords
signals
pulse radar
radar apparatus
target return
real
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81201104A
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German (de)
English (en)
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EP0050384B1 (fr
Inventor
Einac Van Meurs
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Thales Nederland BV
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Thales Nederland BV
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/2605—Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
    • H01Q3/2611—Means for null steering; Adaptive interference nulling
    • H01Q3/2629—Combination of a main antenna unit with an auxiliary antenna unit
    • H01Q3/2635—Combination of a main antenna unit with an auxiliary antenna unit the auxiliary unit being composed of a plurality of antennas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/87—Combinations of radar systems, e.g. primary radar and secondary radar
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/292—Extracting wanted echo-signals
    • G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures

Definitions

  • the invention relates to a method for the cancellation of interference signals from a number n of sources during the reception of target return signals by a pulse radar, of which the receiver comprises a main channel for the reception, i.f. detection, sampling and digitising of signals (E m ), composed of target return signals (E' m ) and of interference signals, and n auxiliary channels for the reception, i.f. detection, sampling and digitising of signals (E,, E 2 , ..., En) composed of target return signals and interference signals.
  • the invention further relates to the pulse radar apparatus employed to implement said method.
  • Such a method and a similar pulse radar apparatus provided with a digital side-lobe canceller are known from an article of IEEE Transactions on Aerospace and Electronic Systems, Vol. AES-14, No. 1, January 1978, pp. 165-171, "A digital open-loop adaptive Processor", by Frank F. Kretschmer Jr and Bernard L. Lewis.
  • the desired interference cancellation is obtained by applying the latter canceller in a cascaded configuration, as described in U.S. Patent No. 4,222,051.
  • the cancellation of interference signals appears to be strongly dependent upon the phase relations between the signals from one and the same interference source in the different channels (primary and auxiliary channels) of the receiver.
  • the present invention has for its object to considerably reduce this phase dependency, and thereby to enhance the interference cancellation.
  • the method as set forth in the opening paragraph comprises the steps of:
  • the weights W 1 , W 2 , ..., W determined by this method are equal to those obtained in the analogue side-lobe canceller after the settling process.
  • the analogue side-lobe canceller is described in U.S. Patent No. 3,202,990.
  • the settling process however appears to be again strongly dependent upon the phase relations between the signals of one and the same interference source in the receiver; the settling process could therefore be extended considerably, while the extent of interference cancellation could remain far from its optimal value.
  • a preferred embodiment of a pulse radar apparatus suitable for the application of the method according to the invention will be dependent upon n.
  • n 1 or 2
  • a hardware implementation is expected to receive preference, whereas for larger values of n the pulse radar apparatus is to contain a programmable signal processor to execute the processing steps of the method according to the invention.
  • Receiver 1 comprises a main channel 2 and n auxiliary channels 3a, 3b, ..., 3n. Both the main and auxiliary channels are suitable for the reception, i.f. detection, sampling and digitising of target return signals and interference signals originating from a maximum number n of sources.
  • the number of auxiliary channels determines the maximum number of interference sources,of which the interference signals can be cancelled.
  • the main channel comprises an antenna directed at the target; this antenna receives in the side lobes signals from interference sources, apart from the target return signals (E' m ) in the major lobe.
  • the target return signals processed in the main channel and interference signals are jointly denoted by E .
  • auxiliary channels comprise in general omni-directional antennas; the target returns processed in these channels and interference signals are jointly denoted by E 1 , E 2 , ..., E n .
  • a quadrature detector is employed, being a combination of two phase-sensitive detectors used to detect the signals, processed in the channels, with a mutual phase shift of 90°.
  • E m , E 1 , E 2 , ..., E n are obtained.
  • These components are conventionally sampled and digitised by AD converters contained in each of the channels.
  • the pulse radar apparatus contains first means to determine from signals E m , E 1 , E 29 ..., E n the quantities corresponding with values E* 1 E m , E* 2 E m , ..., E* n E m ; E* 1 E 1 , E* 2 E 1 , ..., These means are constituted by logical unit 4.
  • Each of the abovementioned quantities is composed of two numerical values, representing the real and the imaginary components.
  • the quantity E* i E J thus comprises the numbers and and
  • the pulse radar apparatus also comprises second means to average the quantities E* 1 E m , E* 2 E m , ..., E* n E m ; E* 1 E 1 , E* 2 E 1 , ..., over several samples to values E* 1 E m , E* 2 E m , ..., E* n E ; E* 1 E 1 , ..., E* n E n .
  • These means are constituted by averaging circuit 5. Also in this circuit the real and the imaginary components of E* i E j are averaged separately; the quantity E*i E j is thus composed of two digital numerical values Re(E* i E j ) and Im(E* j E j ).
  • Logical unit 6 supplies the W i signals, consisting of two components, Re(W.) and Im(W i ).
  • the fourth means are constituted by a third logical unit 7.
  • Logical unit 7 consists of multipliers 8a, 8b, ..., 8n, an adder 9 and a subtractor 10.
  • Logical unit 7 is supplied with signals, provided these signals are delayed over a time T corresponding with the time needed for the determination of W 1' W 2' ..., W n from E m , E 1 , E 2 , ..., E n .
  • the pulse radar apparatus thereto comprises delay elements 11a ' 11b, ..., 11n and 12, each consisting of two parts, namely for the real and the imaginary components of the signal supplied to the delay element.
  • the quantities W i E i again consist of two numerical values Re(W i E i ) and Im(W i E i ).
  • Adder 9 determines the value this sum value also consists of two numerical values:
  • Subtractor 10 finally establishes the value which consists of the numerical values Re(E' m ) and Im(E' m ).
  • the above first, second, third and fourth means together form the digital side-lobe canceller.
  • n 1 or 2.
  • the digital side-lobe canceller is illustrated in greater detail in Figs 2 and 3.
  • the logical unit 4 consists of multipliers 13 to 18, adders 19 and 20 and subtractor 21. These circuits, connected as shown, supply the following output signals:
  • averaging circuit 5 which comprises, for each signal supplied, an adder 22 and a register 23. Iterative addition at the sampling frequency establishes, short of a scale factor, the average value of the signals supplied during a certain time. Processing of the scale factor occurs with the readout of register 23.
  • 2 are supplied to logical unit 6. This unit comprises two dividers, 24 and 25, connected as shown in the figure. The dividers supply the signals:
  • Logical unit 7 comprises four multipliers, 26-29, an adder 30, and subtractors 31, 32 and 33; these circuits are connected as shown in the figure.
  • Logical unit 7 is also supplied with signals Re(E m ) V , Im(E m ) V , Re(E 1 ) V and Im(E 1 ) V ; these are the signals supplied to logical unit 4 after being delayed over a time corresponding with the processing time of these signals in logical unit 4, averaging circuit 5 and logical unit 6.
  • the output signals of logical unit 7 are:
  • Logical unit 4 here receives signals Re(E m ), Im(E m ), Re(E I ), Im(E I ), Re(E 2 ) and Im(E 2 ).
  • Logical unit 4 comprises multipliers 34-49, adders 50-54 and subtractors 55-57, connected as shown in the figure.
  • the output signals of logical unit 4 are:
  • Circuit 5 again comprises for each signal supplied an adder 58 and a register 59, whose function is similar to that of elements 22 and 23 of Fig. 2.
  • the output signals of averaging circuit 5 are: Re(E* 1 E m ), Im(E *1 E m ), These signals are fed to logical unit 6.
  • Unit 6 comprises multipliers 60-74, combining circuits 75-79 and dividers 80-P3, connected as shown in the figure.
  • the output signals of logical unit 6 are:
  • Unit 7 comprises multipliers 84-91, adders 92-95 and subtractors 96-99, connected as shown in the figure.
  • Logical unit 7 is also supplied with signals Re(E m ) V , Im(E m ) V , Re(E 1 ) V , Im(E 1 ) V , Re(E2 ) V and Im(E2)V; these are the signals fed to logical unit 4 after being delayed over a time corresponding with the processing time of these signals in logical unit 4, averaging circuit 5 and logical unit 6.
  • the output signals of logical unit 7 are now:
  • n is greater than 2
  • a programmable signal processor for implementing the process steps of the methods according to the invention under the control of a suitable program.
  • this program will be written on the same mathematical basis as that of the hardware described.
  • the result of the method here described is such that the interference cancellation obtained is highly independent of the phase relations between the signals of the same interference source in the different channels.
  • Omnidirectional antennas are utilised in the auxiliary channels; should these antennas be replaced by directional antennas, each of which to be directed to an interference source, a still better interference cancellation and a still greater independence of the phase relations would be obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Noise Elimination (AREA)
EP81201104A 1980-10-17 1981-10-06 Elimination, dans un récepteur radar à impulsions, de signaux parasites provenant de N sources distinctes Expired EP0050384B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8005725A NL8005725A (nl) 1980-10-17 1980-10-17 Werkwijze en inrichting voor het onderdrukken van stoorsignalen, afkomstig van storingsbronnen, gedurende de ontvangst van doelsechosignalen in de ontvanginrichting van een impulsradarapparaat.
NL8005725 1980-10-17

Publications (2)

Publication Number Publication Date
EP0050384A1 true EP0050384A1 (fr) 1982-04-28
EP0050384B1 EP0050384B1 (fr) 1986-05-28

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Family Applications (1)

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EP81201104A Expired EP0050384B1 (fr) 1980-10-17 1981-10-06 Elimination, dans un récepteur radar à impulsions, de signaux parasites provenant de N sources distinctes

Country Status (7)

Country Link
EP (1) EP0050384B1 (fr)
JP (1) JPS5796278A (fr)
AU (1) AU541554B2 (fr)
CA (1) CA1161931A (fr)
DE (1) DE3174721D1 (fr)
NL (1) NL8005725A (fr)
NO (1) NO156343C (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0226401A2 (fr) * 1985-12-05 1987-06-24 Raytheon Company Détection d'interférence d'impulsion pour un système de radar
FR2621399A1 (fr) * 1987-08-04 1989-04-07 Raytheon Co Reseau de reception avec annulation d'interferences
FR2632419A1 (fr) * 1983-11-08 1989-12-08 Thomson Csf Procede et dispositif d'antibrouillage pour radar et radar equipe d'un tel dispositif
RU2504790C1 (ru) * 2012-05-24 2014-01-20 Открытое акционерное общество "Российская корпорация ракетно-космического приборостроения и информационных систем" (ОАО "Российские космические системы") Способ и устройство поиска и обнаружения сигналов
CN104765021A (zh) * 2015-04-22 2015-07-08 芜湖航飞科技股份有限公司 一种雷达抗干扰系统及其方法
DE102021123693B3 (de) 2021-09-14 2023-02-02 H-Next Gmbh Verfahren und Vorrichtung zur Verarbeitung von Signalen

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5990404A (ja) * 1982-11-16 1984-05-24 Mitsubishi Electric Corp サイドロ−ブ・キヤンセラ
JPH06100647B2 (ja) * 1983-10-19 1994-12-12 日本電気株式会社 コヒアレントサイドロ−ブキャンセラ
NL8901826A (nl) * 1989-07-14 1991-02-01 Hollandse Signaalapparaten Bv Pulsradarappraat en pulsdiscriminatieschakeling geschikt voor toepassing in een pulsradarapparaat.
CN106483506B (zh) * 2016-10-26 2019-03-22 河海大学 一种认知型自适应干扰抑制方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202990A (en) * 1959-05-04 1965-08-24 Gen Electric Intermediate frequency side-lobe canceller
US3725922A (en) * 1971-09-13 1973-04-03 Technology Service Corp Convergence rate improvement for adaptive receiving array antennas of higher order than 2-pulse mti cancellers
US3727220A (en) * 1971-09-13 1973-04-10 Technology Service Corp Adaptive receiving array method and apparatus for mti radar
US3982245A (en) * 1974-07-15 1976-09-21 General Electric Company Sidelobe canceller with programmable correlation signal weighting
US3995271A (en) * 1975-08-20 1976-11-30 The United States Of America As Represented By The Secretary Of The Air Force Adaptive clutter cancellation and interference rejection system for AMTI radar
US4035799A (en) * 1975-11-04 1977-07-12 The United States Of America As Represented By The Secretary Of The Navy Digital mean clutter doppler compensation system
US4086592A (en) * 1977-07-22 1978-04-25 The United States Of America As Represented By The Secretary Of The Navy Digital sidelobe canceller
US4222051A (en) * 1979-01-18 1980-09-09 The United States Of America As Represented By The Secretary Of The Navy Cascaded digital cancelers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202990A (en) * 1959-05-04 1965-08-24 Gen Electric Intermediate frequency side-lobe canceller
US3725922A (en) * 1971-09-13 1973-04-03 Technology Service Corp Convergence rate improvement for adaptive receiving array antennas of higher order than 2-pulse mti cancellers
US3727220A (en) * 1971-09-13 1973-04-10 Technology Service Corp Adaptive receiving array method and apparatus for mti radar
US3982245A (en) * 1974-07-15 1976-09-21 General Electric Company Sidelobe canceller with programmable correlation signal weighting
US3995271A (en) * 1975-08-20 1976-11-30 The United States Of America As Represented By The Secretary Of The Air Force Adaptive clutter cancellation and interference rejection system for AMTI radar
US4035799A (en) * 1975-11-04 1977-07-12 The United States Of America As Represented By The Secretary Of The Navy Digital mean clutter doppler compensation system
US4086592A (en) * 1977-07-22 1978-04-25 The United States Of America As Represented By The Secretary Of The Navy Digital sidelobe canceller
US4222051A (en) * 1979-01-18 1980-09-09 The United States Of America As Represented By The Secretary Of The Navy Cascaded digital cancelers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS, volume AES-14, nr. 1, January 1978, New York (US) F.K. KRETSCHMER Jr. et al.: "A digital open-loop adaptive processor", pages 165-171 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2632419A1 (fr) * 1983-11-08 1989-12-08 Thomson Csf Procede et dispositif d'antibrouillage pour radar et radar equipe d'un tel dispositif
EP0226401A2 (fr) * 1985-12-05 1987-06-24 Raytheon Company Détection d'interférence d'impulsion pour un système de radar
EP0226401A3 (en) * 1985-12-05 1988-08-31 Raytheon Company Pulse interference detection for a radar system
FR2621399A1 (fr) * 1987-08-04 1989-04-07 Raytheon Co Reseau de reception avec annulation d'interferences
RU2504790C1 (ru) * 2012-05-24 2014-01-20 Открытое акционерное общество "Российская корпорация ракетно-космического приборостроения и информационных систем" (ОАО "Российские космические системы") Способ и устройство поиска и обнаружения сигналов
CN104765021A (zh) * 2015-04-22 2015-07-08 芜湖航飞科技股份有限公司 一种雷达抗干扰系统及其方法
DE102021123693B3 (de) 2021-09-14 2023-02-02 H-Next Gmbh Verfahren und Vorrichtung zur Verarbeitung von Signalen
WO2023041555A1 (fr) 2021-09-14 2023-03-23 H-Next Gmbh Procédé et dispositif de traitement de signaux

Also Published As

Publication number Publication date
JPS5796278A (en) 1982-06-15
DE3174721D1 (en) 1986-07-03
CA1161931A (fr) 1984-02-07
JPH0153432B2 (fr) 1989-11-14
EP0050384B1 (fr) 1986-05-28
NO813465L (no) 1982-04-19
AU541554B2 (en) 1985-01-10
NO156343B (no) 1987-05-25
NL8005725A (nl) 1982-05-17
AU7621781A (en) 1982-04-22
NO156343C (no) 1987-09-02

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